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AT Commands For SSL

 

 

 

No Command Description
L1001 AT+CCHSTART Start SSL service
L1002 AT+CCHSTOP Stop SSL service
L1003 AT+CCHOPEN Connect to SSL server
L1004 AT+CCHCLOSE Disconnect from SSL server
L1005 AT+CCHSEND Send data to SSL server
L1006 AT+CCHRECV Read the cached data that received from the SSL server
L1007 AT+CCHADDR Get the IPV4 address
L1008 AT+CCHCFG Configure the client context
L1009 AT+CCHSSLCFG Set the SSL context
L1010 AT+CCHSET Configure the report mode of sending and receiving data
L1011 AT+CCHMODE Configure the mode of sending and receiving data
L1012 AT+CSSLCFG Configure the SSL context
L1013 AT+CCERTDOWN Download certificate into the module
L1014 AT+CCERTLIST List certificates
L1015 AT+CCERTDELE Delete certificates

 

 

 

 

L1001   AT+CCHSTART     Start SSL Service 

AT+CCHSTART is used to start SSL service by activating PDP context.

You must execute AT+CCHSTART before any other SSL related operations.

E) AT+CCHSTART

a)If start SSL service successfully:

OK

+CCHSTART: 0

b) If start SSL service successfully:

+CCHSTART: 0

 OK

c) If failed:

ERROR

d) If failed:

OK

 +CCHSTART: <err>

Maximum Response Time 120000ms

 

<err> Integer type, which indicates the result code.

 

Example

AT+CCHSTART

OK

+CCHSTART: 0

 

NOTE

You must execute AT+CCHSTART before any other SSL related operations

 

 

 

 

L1002   AT+CCHSTOP     Stop SSL Service  

AT+CCHSTOP is used to stop SSL service.

 

E) AT+CCHSTOP

a)If stop SSL service successfully:

+CCHSTOP: 0

OK

b)If stop SSL service successfully:

OK

+CCHSTOP: 0

c)If failed:

ERROR

 

<err> Integer type, which indicates the result code.

 

Example

AT+CCHSTOP

OK

+CCHSTOP: 0

 

  

 

 

L1003   AT+CCHOPEN      Connect To SSL Server

This command is used to connect to SSL server.

Note: If there is other service working in transparent mode, it is not allowed setup transparent connection by cchopen cmd.

 

T) AT+CCHOPEN=?

+CCHOPEN: (0-1),”ADDRESS”,(1-65535)[,(1-2)[,(1-65535)]]

 OK

R) AT+CCHOPEN?

If connect to a server, it will show the connected information. Otherwise, the connected information is empty.

+CCHOPEN: 0,”<host>”,<port>,<client_type>[,<bind_port>]

+CCHOPEN: 1,”<host>”,<port>,<client_type>[,<bind_port>]

 OK

W) AT+CCHOPEN=<session_id>,

”host”,<port>

[,<client_type>[,<bind_port>]]

a) If connect successfully:

+CCHOPEN: <session_id>,0

 OK

b) If connect successfully:

OK

 +CCHOPEN: <session_id>,0

c) If connect successfully in transparent mode:

CONNECT [<text>]

d) If failed:

OK

 +CCHOPEN: <session_id>,<err>

[+CCHCLOSE: <session_id>,<err>]

e)If failed:

ERROR

f)If failed in transparent mode:

CONNECT FAIL

 

<session_id> The session index to operate. It’s from 0 to 1.
<host> The server address, length range is 1 to 256.
<port> The server port which to be connected, the range is from 1 to 65535.
<client_type>

The type of client:

1     TCP client.

2     SSL/TLS client.

Default value is 2.

<bind_port> The local port for channel, the range is from 1 to 65535.
<text> CONNECT result code string; the string formats please refer ATX/AT\V/AT&E command.
<err> Integer type, the result of operation. 0 is success, other value is failure.

 

Example

AT+CCHOPEN=0,”www.baidu.com”,443,2

OK

+CCHOPEN: 0,0

 

NOTE

If you don’t set the SSL context by AT+CCHSSLCFG before connecting a SSL/TLS server by AT+CCHOPEN,

it will use the <session_id> (the 1’st parameter of AT+CCHOPEN) SSL context when connecting to the server.

 

 

 

 

L1004   AT+CCHCLOSE     Disconnect From SSL Server

AT+CCHCLOSE is used to disconnect from the server.

 

W) AT+CCHCLOSE=<session_id>

a)If successfully:

+CCHCLOSE: <session_id>,0

OK

b)If successfully:

OK

+CCHCLOSE: <session_id>,0

c)If successfully in transparent mode:

OK

CLOSED

d)If failed:

ERROR

  

<session_id> The session index to operate. It’s from 0 to 1.
<err> Integer type, the result of operation. 0 is success, other value is failure

 

Example

AT+CCHCLOSE=0

OK

+CCHCLOSE: 0,0

 

  

 

 

L1005   AT+CCHSEND     Send Data To SSL Server

AT+CCHCLOSE is used to disconnect from the server.

 

T) AT+CCHSEND=?

+CCHSEND: (0-1),(1-2048)

 OK

R) AT+CCHSEND?

+CCHSEND: 0,<unsent_len_0>,1,<unsent_len_1>

OK

W) AT+CCHSEND=<session_id>,
<len>

a)if parameter is right:

> <input data here>

When the total size of the inputted data reaches <len>, TA will report the following code.

Otherwise, the serial port will be blocked.

OK

b)If parameter is wrong or other errors occur:

ERROR

  

<session_id> The session index to operate. It’s from 0 to 1.
<len> The length of data to send. Its range is from 1 to 2048 bytes.
<unsent_len_0> The data of connection 0 cached in sending buffer which is waiting to be sent.
<unsent_len_1> The data of connection 1 cached in sending buffer which is waiting to be sent.

 

Example

AT+CCHSEND=0,125

> GET / HTTP/1.1

Host: www.google.com.hk

User-Agent: MAUI htp User Agent

Proxy-Connection: keep-alive

Content-Length: 0

 OK

 

 

  

 

L1006   AT+CCHRECV     Read The Cached Data That Received From The Server

 You can use AT+CCHRECV to read the cached data which received from the server.

 

R) AT+CCHRECV?

+CCHRECV: LEN,<cache_len_0>,<cache_len_1>

 OK

W) AT+CCHRECV=<session_id>

[,<max_recv_len>]

a)if parameter is right and there are cached data:

OK

[+CCHRECV: DATA,<session_id>,<len>

+CCHRECV: DATA,<session_id>,<len>

…]

+CCHRECV: <session_id>,<err>

 

b) if parameter is not right or any other error occurs:

+CCHRECV: <session_id>,<err>

ERROR

 

<session_id> The session_id to operate. It’s from 0 to 1.
<max_recv_len>

Maximum bytes of data to receive in the current AT+CCHRECV calling.

It will read all the received data when the value is greater than the length of RX data cached for

session <session_id>.

0 means the maximum bytes to receive is 2048 bytes.

(But, when 2048  is  greater  than  the  length  of  RX  data  cached  for  session <session_id>,

0  means the length of RX data cached for session <session_id>).

The default value is the length of RX data cached for session <session_id>.

It will be not allowed when there is no data in the cache.

<cache_len_0> The length of RX data cached for connection 0.
<cache_len_1> The length of RX data cached for connection 1.
<len> The length of data followed.
<err> String type, displays the cause of occurring error, please refer to Chapter 10.3 for details.

 

Example

AT+CCHRECV=1

OK

+CCHRECV: DATA,1,249

HTTP/1.1 200 OK

Content-Type: text/html

Content-Language: zh-CN

Content-Length: 57

Date: Tue, 31 Mar 2009 01:56:05 GMT

Connection: Close

Proxy-Connection: Close

 

<html>

<header>test</header>

<body> Test body

</body>

 

+CCHRECV: 1,0

 

 

 

 

L1007   AT+CCHADDR     Get IPV4 Address

AT+CCHADDR is used to inquire socket PDP address.

 

E) AT+CCHADDR

+CCHADDR: <ip_address>

OK

  

<ip_address> A string parameter that identifies the IPV4 address after PDP activated.

 

Example

AT+CCHADDR

+CCHADDR: 10.71.155.118

OK

  

 

 

 

L1008   AT+CCHCFG     Configure The Client Context

AT+CCHCFG is used to set the client session context. It must be called before AT+CCHOPEN and after AT+CCHSTART.

The setting will be cleared after AT+CCHOPEN failed or AT+CCHCLOSE.

 

T) AT+CCHCFG=?

+CCHCFG: “sendtimeout”,(0-1),(60-150)

+CCHCFG: “sslctx”,(0-1),(0-9)

OK

R) AT+CCHCFG?

+CCHCFG: 0,<sendtimeout_val>,<sslctx_index>

+CCHCFG: 1,<sendtimeout_val>,<sslctx_index>

OK

Configure the timeout value of

the specified client when sending data.

W) AT+CCHCFG=”sendtimeout”,

<session_id>,<sendtimeout_val>

If successfully:

OK

If failed:

ERROR

Configure the SSL context index,

it’s as same as AT+CSSLCFG

W)  AT+CCHCFG=”sslctx”,<session_id>,

<sslctx_index>

If successfully:

OK

If failed:

ERROR

  

<session_id> The session_id to operate. It’s from 0 to 1.
<sendtimeout_val>

The timeout value used in sending data stage. The range is 60-150 seconds.

The default value is 150.

<sslctx_index>

The SSL context ID which will be used in the SSL connection.

Refer to the <ssl_ctx_index> of AT+CSSLCFG.

 

Example

AT+CCHCFG=”sendtimeout”,0,60

OK

 

NOTE

This command must be called before AT+CCHOPEN and after AT+CCHSTART.

The setting will be cleared after AT+CCHOPEN failed or AT+CCHCLOSE.

 

 

 

 

L1009   AT+CCHSSLCFG     Set The SSL Context

AT+CCHSSLCFG is used to set the SSL context which to be used in the SSL connection.

It must be called before AT+CCHOPEN and after AT+CCHSTART.

The setting will be cleared after AT+CCHOPEN failed or AT+CCHCLOSE.

Note: If you don’t set the SSL context by this command before connecting to SSL/TLS server by AT+CCHOPEN,

the CCHOPEN operation will use the SSL context as same as index <session_id> (the 1st parameter of AT+CCHOPEN) when connecting to the server.

 

T) AT+CCHSSLCFG=?

+CCHSSLCFG: (0-1),(0-9)

 OK

R) AT+CCHSSLCFG?

+CCHSSLCFG: <session_id>,[ssl_ctx_index]

+CCHSSLCFG: <session_id>,[ssl_ctx_index]

 OK

W) AT+CCHSSLCFG=<session_id>,

<ssl_ctx_index>

a)  If successfully:

OK

b)  If failed:

ERROR

 

<session_id> The session_id to operate. It’s from 0 to 1.
<ssl_ctx_index>

The SSL context ID which will be used in the SSL connection.

Refer to the <ssl_ctx_index> of AT+CSSLCFG.

 

Example

AT+CCHSSLCFG=?

+CCHSSLCFG: (0-1),(0-9)

OK

AT+CCHSSLCFG=1,1

OK

 

NOTE

This command must be called before AT+CCHOPEN and after AT+CCHSTART.

The setting will be cleared after AT+CCHOPEN failed or AT+CCHCLOSE.

If you don’t set the SSL context by this command before connecting to SSL/TLS server by AT+CCHOPEN,

the CCHOPEN operation will use the SSL context as same as index <session_id> (the 1st parameter of AT+CCHOPEN) when connecting to the server.

 

 

 

 

L1010   AT+CCHMODE     Configure The Mode Of Sending And Receiving Data 

AT+CCHMODE is used to elect transparent mode (data mode) or non-transparent mode (command mode).

The default mode is non-transparent mode. This AT command must be called before calling AT+CCHSTART.

Note: There is only one session in the transparent mode, it’s the first session

 

T) AT+CCHMODE=?

+CCHMODE: (0-1)

OK

R) AT+CCHMODE?

+CCHMODE: <mode>

OK

W) AT+CCHMODE=<mode>

a)  If successfully:

OK

b)  If failed:

ERROR

  

<mode>

The mode value: (The default value is 0)

0     Normal

1     Transparent mode

 

Example

AT+CCHMODE=?

+CCHMODE: (0-1)

OK

AT+CCHMODE=1

OK

 

NOTE

This command must be called before AT+CCHSTART.

There is only one session in the transparent mode, it’s the first

 

 

 

 

L1011   AT+CCHSET     Configure The Report Mode Of Sending And Receiving Data

AT+CCHMODE is used to elect transparent mode (data mode) or non-transparent mode (command mode).

The default mode is non-transparent mode. This AT command must be called before calling AT+CCHSTART.

Note: There is only one session in the transparent mode, it’s the first session

T) AT+CCHSET=?

+CCHSET: (0-1),(0,1)

 OK

R) AT+CCHSET?

+CCHSET: <report_send_result>,<recv_mode>

 OK

W) AT+CCHSET=

<report_send_result>[,<recv_mode>]

a)  If successfully:

OK

b)  If failed:

ERROR

  

<report_send_result>

Whether to report result of CCHSEND, the default value is 0:

0     No.

1     Yes.

Module will report +CCHSEND: <session_id>,<err> to MCU when complete sending data.

<recv_mode>

The receiving mode:

0     Output the data to MCU whenever received data.

1     Module caches the received data and notifies MCU with +CCHEVENT: <session_id>, RECV EVENT.

MCU can use AT+CCHRECV to receive the cached data (only in manual receiving mode).

 

Example

AT+CCHSET=?

+CCHSET: (0-1),(0,1)

OK

AT+CCHSET=1,1

OK

 

NOTE

This command must be called before AT+CCHSTART.

 

   

 

 

L1012   AT+CSSLCFG    Configure The SSL Context

AT+CSSLCFG is used to configure the SSL context.

T) AT+CSSLCFG=?

+CSSLCFG: “sslversion”,(0-9),(0-4)

+CSSLCFG: “authmode”,(0-9),(0-3)

+CSSLCFG: “ignorelocaltime”,(0-9),(0,1)

+CSSLCFG: “negotiatetime”,(0-9),(10-300)

+CSSLCFG: “cacert”,(0-9),(5-128)

+CSSLCFG: “clientcert”,(0-9),(5-128)

+CSSLCFG: “clientkey”,(0-9),(5-128)

+CSSLCFG: “enableSNI”,(0-9),(0,1)

+CSSLCFG: “keypwd”,(0-9),(0-128)

+CSSLCFG: “ciphersuites”,(0-9),(0x002F,0xFFFF)

 OK

R) AT+CSSLCFG=?

+CSSLCFG:

0,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSSLCFG:

1,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSLCFG:

2,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSSLCFG:

3,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSSLCFG:

4,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSSLCFG:

5,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSSLCFG:

6,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSSLCFG:

7,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSSLCFG:

8,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

+CSSLCFG:

9,<sslversion>,<authmode>,<ignoreltime>,<negotiatetime>,<ca_file>,<clientcert_file>,

<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

OK

Query the configuration of the specified SSL context.

W) AT+CSSLCFG=<ssl_ctx_index>

+CSSLCFG:

<ssl_ctxindex>,<sslversion>,<authmode>,<ignoreltime>,<negot iatetime>,<ca_file>,

<clientcert_file>,<clientkey_file>,<enalbeSNI_flag>,<keypwd>,<ciphersuites>

 OK

Configure the version of  the specified SSL context

W) AT+CSSLCFG=”sslversion”,

< ssl_ctx_index>,<sslversion>

a) If successfully:

OK

b) If failed:

ERROR

Configure the authentication of the specified SSL context

W) AT+CSSLCFG=”authmode”,

<ssl_ctx_index>,<authmode>

a) If successfully:

OK

b) If failed:

ERROR

Configure the ignore local time flag of the specified SSL context

W) AT+CSSLCFG=”ignorelocaltime”

,<ssl_ctx_index>,<ignoreltime>

a) If successfully:

OK

b) If failed:

ERROR

Configure the negotiate timeout value of the specified SSL context.

W) AT+CSSLCFG=”negotiatetime”,

<ssl_ctx_index>,<negotiatetime>

a) If successfully:

OK

b) If failed:

ERROR

Configure the server root CA of the specified SSL context.

W) AT+CSSLCFG=”cacert”,

<ssl_ctx_index>,<ca_file>

a) If successfully:

OK

b) If failed:

ERROR

Configure the client certificate of the specified SSL context.

W) AT+CSSLCFG=”clientcert”,

<ssl_ctx_index>,<clientcert_file> 

a) If successfully:

OK

b) If failed:

ERROR

Configure the client key of the specified SSL context.

W) AT+CSSLCFG=”clientkey”,

<ssl_ctx_index>,<clientkey_file> 

a) If successfully:

OK

b) If failed:

ERROR

Configure the enableSNI flag of the specified SSL context.

W) AT+CSSLCFG=”enableSNI”,

<ssl_ctx_index>,<enableSNI_Flag>

a) If successfully:

OK

b) If failed:

ERROR

Configure the password of the specified SSL context.

W) AT+CSSLCFG=”keypwd”,

<ssl_ctx_index>,<keypwd>

a) If successfully:

OK

b) If failed:

ERROR

Configure the ciphersuite of the specified SSL context.

W) AT+CSSLCFG=”ciphersuites”,

<ssl_ctx_index>,<ciphersui tes>

a)If successfully:

OK

b)If failed:

ERROR

 

<ssl_ctx_index> The SSL context ID. The range is 0-9.
<sslversion>

The SSL version, the default value is 4.

0     SSL3.0

1     TLS1.0

2     TLS1.1

3     TLS1.2

4     All

 The configured version should be support by server.

So you should use the default value if you can’t confirm the version which the server supported.

<authmode>

The authentication mode, the default value is 0.

0     no authentication.

1     server authentication. It needs the root CA of the server.

2     server and client authentication. It needs the root CA of the server, the cert and key of the client.

3     client authentication and no server authentication. It needs the cert and key of the client.

<ignoreltime>

The flag to indicate how to deal with expired certificate, the default value is 1.

0     care about time check for certification.

1     ignore time check for certification

 When set the value to 0, it need to set the right current date and time by AT+CCLK when need SSL certification.

<negotiatetime>

The timeout value which is used in SSL negotiating stage.

The range is 10-300 seconds. The default value is 300.

<ca_file>

The root CA file name of SSL context. The file name must have type like “.pem” or “.der”.

The length of filename is from 5 to 128 bytes.

If the filename contains non-ASCII characters, the file path parameter should contain a prefix of

{non-ascii} and the quotation mark (The string in the quotation mark should be hexadecimal of

the filename’s UTF8 code).

 

There are two ways to download certificate files to module:

1. By AT+CCERTDOWN.

2. By FTPS or HTTPS commands. Please refer to chapter 12 and 13.

<clientcert_file>

The client cert file name of SSL context. The file name must have type like “.pem” or “.der”.

The length of filename is from 5 to 128 bytes.

If the filename contains non-ASCII characters, the file path parameter should contain a prefix of

{non-ascii} and the quotation mark (The string in the quotation mark should be hexadecimal of

the filename’s UTF8 code).

 

There are two ways to download certificate files to module:

1. By AT+CCERTDOWN.

2. By FTPS or HTTPS commands. Please refer to chapter 12 and 13.

<clientkey_file>

The client key file name of SSL context.

The file name must have type like “.pem” or “.der”. The length of filename is from 5 to 128 bytes.

If the filename contains non-ASCII characters, the file path parameter should contain a prefix of

{non-ascii} and the quotation mark (The string in the quotation mark should be hexadecimal of

the filename’s UTF8 code).

 

There are two ways to download certificate files to module:

1. By AT+CCERTDOWN.

2. By FTPS or HTTPS commands. Please refer to chapter 12 and 13.

<enableSNI_flag>

The flag to indicate that enable the SNI flag or not, the default value is 0.

0     not enable SNI.

1     enable SNI.

<keypwd>

The password of the client key file of SSL context.

When the client needs to be authorized, client key file is needed.

Because the client key file may be encrypted, we need the<keypwd> to decrypt it.

The length of <keypwd> is from 0 to 128bytes.

<ciphersuites>

Numeric type, SSL ciphersuites 

0x002F     TLS_RSA_WITH_AES_128_CBC_SHA 

0xFFFF     Support all

 

Example

AT+CSSLCFG=”sslversion”,1,1

OK

 

 

 

 

L1013   AT+CCERTDOWN     Download Certificate Into The Module

AT+CCERTDOWN is used to download certificate files into the module.

 

T) AT+CCERTDOWN=?

+CCERTDOWN: (5-128),(1-10240)

 OK

W) AT+CCERTDOWN=<filename>,

<len>

a) If it can be download:

<input data here>

 OK

b) If failed:

ERROR

 

<filename>

The name of the certificate/key file. The file name must have type like “.pem” or “.der”.

The length of filename is from 5 to 128 bytes.

If the filename contains non-ASCII characters, the file path parameter should contain a prefix of

{non-ascii} and the quotation mark

(The string in the quotation mark should be hexadecimal of the filename’s UTF8 code).

 

For example: If you want to download a file with name “中华.pem”,

you should convert the  “中华.pem” to UTF8 coding (&#x4E2D;&#x534E;.pem),

then input the hexadecimal (262378344532443B262378353334453B2E70656D) of UTF8 coding.

<len> The length of the file data to send. The range is from 1 to 10240 bytes.

 

Example

AT+CCERTDOWN=”client_key.der”,611

> file content……

OK

 

 

 

 

L1014   AT+CCERTLIST      List Certificates

AT+CCERTLIST is used to list certificate files of the module.

 

E) AT+CCERTLIST

[+CCERTLIST: <file_name>

[+CCERTLIST: <file_name>]

<CR><LF>]

OK

 

<file_name>

The certificate/key files which has been downloaded to the module.

If the filename contains non-ASCII characters, it will show the non-ASCII characters as UTF8 code.

 

Example

AT+CCERTLIST

+CCERTLIST: “ca_cert.der”

+CCERTLIST: “client_key.pem””

OK

 

 

 

 

L1015   AT+CCERTDELE      Delete Certificates

 AT+CCERTDELE is used to remove certificate files from the module.

 

W) AT+CCERTDELE=<filename>

a)If delete successfully:

OK

b)If failed:

ERROR

 

<filename>

The name of the certificate/key file.

The file name must have type like “.pem” or “.der”. The length of filename is from 5 to 128 bytes.

If the filename contains non-ASCII characters, the file path parameter should contain a prefix of

{non-ascii} and the quotation mark

(The string in the quotation mark should be hexadecimal of the filename’s UTF8 code).

 

For example: If you want to download a file with name “中华.pem”,

you should convert the “ 中 华 .pem” to UTF8 coding (&#x4E2D;&#x534E;.pem),

then input the hexadecimal (262378344532443B262378353334453B2E70656D) of UTF8 coding.

 

Example

AT+CCERTDELE=”server_ca.der”

OK

 

 

 

 

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